Top Definition
When gravity is the only thing standing in the way of a male from sexual activity. This largely occurs in college afterparty situations where one is too intoxicated to climb up a simple ladder.
Guy 1: "So what happened with you and that girl last night?"
Guy 2: "She said she was down so we went back to my dorm."
Guy 1: "Alright man! So how was she?!"
Guy 2: "I don't know man we got to my bunk but we couldn't get up the bed. Total gravity cock block."
by CollegeDormBoy October 19, 2011

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